This is a solid-state Tesla coil. The primary runs at its resonant frequency in the 41 KHz range, and is modulated from the control unit in order to generate the tones you hear.
So just to explain a little further, yes, it is the actual high voltage sparks that are making the noise. Every cycle of the music is a burst of sparks at 41 KHz, triggered by digital circuitry at the end of a "long" piece of fiber optics.
Just copy and past the url of the youtube page right into your message.edit: how do you embed shit i feel like dorian here
+1So that was Wolves in the Throne Room? Won't be listening to them. Ever.
One of the greatest videos on the planet.Benny Lava is the manliest man on earth...
think it has something to do with the punk elements present in the music or something.